Blockchain Papers

EbenezerBoahene Teye, Hyoungmin Ham

현대 사이버 공간에서 데이터는 가장 중요하고 높은 가치를 가진다. 데이터 중에서도 스마트홈처럼, 사적이고, 안전하고, 보호되어야 하는 장소의 데이터의 중요성은 더 크다. 스마트 홈에는 라이프스타일 패턴, 건강데이터 등과 같은 민감한 개인 사용자 데이터가 포함되어 있기 때문이다. 스마트 홈에서 스마트 장치에 의해 수집되거나 생성된 데이터로 인한 개인 정보 및 보안 위험은 무단 액세스 및 사용으로부터 보호되어야 한다. 최근 Distributed Ledger Technology(DLT)가 견인력을 얻으면서 전통적인 스마트 홈의 아키텍처는 현재 DLT를 스마트 홈 IoT 환경에 통합하기 위해 변경되고 있다. 그러나 1세대 DLT인 블록체인은 확장성 부족, 낮은 처리량, 확률적 합의, 선행 실행 등의 한계가 있어 고도로 분산된 스마트 홈 IoT 환경에 적합하지 않다. 본 논문에서는 DLT를 스마트 홈 IoT 환경에 통합하기 위한 Hedera Hashgraph 아키텍처를 제안한다. 제안된 아키텍처의 성능 분석을 통해, 낮은 트랜잭션 대기 시간을 유지하면서 개인 정보 보호 및 보안을 강화하는 안전하고 효율적인 스마트 홈 환경을 보장하는 것이 가능하다는 결과를 도출하였다.

Yangsun Lee

The hyperledger fabric is a modular blockchain framework used by private companies to develop blockchain-based products, solutions, and applications using plug-and-play components. The smart contracts operating in this framework is created by implementing a chaincode. When implementing a chaincode, there may be a security weakness inside the code, which is the root cause of the security vulnerability. However, when the contract is completed and the block is created, the chaincode cannot be arbitrarily modified, so the security weakness must be analyzed before execution. This paper conducted a study on chaincode intermediate code generation for security weakness analysis of chaincode operating in hyperledger fabric blockchain framework. Analysis of security weaknesses at the source code level is not easy because the code logic is not clear and the complexity is high. On the other hand, security weakness analysis at the intermediate code level is easy to analyze because the code logic of the source code is clearly represented and the complexity is lower than that of the source code.

Suyeon Kim, Hyun Kook Kahng

In this paper, We studied the operation of distributed ledger technology used as a core technology for smart contracts and the components of distributed ledger technology. As a solution applying the entity of distributed ledger technology to NoE, we proposed the protocol of the distributed ledger technology using the thing user social group management function of NoE protocols being standardized in ISO/IEC JTC1 SC6. The management function of things user social group in NoE provides stable protocol functions and data transmission management, and provides group management functions such as member discovery function and data transmission channel management function. It is expected to be useful for member management functions of distributed ledger nodes by providing a service that apply the component of distributed ledger technology. We intend to actively reflect this technology in the future network functions of ISO/IEC JTC1 SC6, which is undergoing standardization.

Koki YOKOYAM, Kazuyuki Morioka

Intelligent space is an environmental robot system where many intelligent sensor nodes are distributed for supporting humans and mobile robots. This paper introduces a blockchain-based sensor network system for the intelligent space. Blockchain is a system for distributed ledgers of crypto currencies such as bitcoin. Recently, blockchain is considered to be effective for construction of distributed sensor network systems without central servers. In this paper, a prototype sensor system with blockchain based on Ethereum is introduced for intelligent space.